const tagsView = {
    state: {
        visitedViews: [],
        cachedViews: []
    },
    mutations: {
        ADD_VISITED_VIEW: (state, view) => {
            if (state.visitedViews.some(v => v.path === view.path)) return;
            state.visitedViews.unshift(
                Object.assign({}, view, {
                    title: view.meta.title || "no-name"
                })
            );
        },
        ADD_CACHED_VIEW: (state, view) => {
            if (state.cachedViews.includes(view.name)) return;
            if (!view.meta.noCache) {
                state.cachedViews.unshift(view.name);
            }
        },

        DEL_VISITED_VIEW: (state, view) => {
            for (const [i, v] of state.visitedViews.entries()) {
                if (v.path === view.path) {
                    state.visitedViews.splice(i, 1);
                    break;
                }
            }
        },
        DEL_CACHED_VIEW: (state, view) => {
            for (const i of state.cachedViews) {
                if (i === view.name) {
                    const index = state.cachedViews.indexOf(i);
                    state.cachedViews.splice(index, 1);
                    break;
                }
            }
        },

        DEL_OTHERS_VISITED_VIEWS: (state, view) => {
            for (const [i, v] of state.visitedViews.entries()) {
                if (v.path === view.path) {
                    state.visitedViews = state.visitedViews.slice(i, i + 1);
                    break;
                }
            }
        },
        DEL_OTHERS_CACHED_VIEWS: (state, view) => {
            for (const i of state.cachedViews) {
                if (i === view.name) {
                    const index = state.cachedViews.indexOf(i);
                    state.cachedViews = state.cachedViews.slice(index, index + 1);
                    break;
                }
            }
        },

        DEL_ALL_VISITED_VIEWS: state => {
            state.visitedViews = [];
        },
        DEL_ALL_CACHED_VIEWS: state => {
            state.cachedViews = [];
        },

        UPDATE_VISITED_VIEW: (state, view) => {
            for (let v of state.visitedViews) {
                if (v.path === view.path) {
                    v = Object.assign(v, view);
                    break;
                }
            }
        }
    },
    actions: {
        addView({ dispatch }, view) {
            dispatch("addVisitedView", view);
            dispatch("addCachedView", view);
        },
        addVisitedView({ commit }, view) {
            commit("ADD_VISITED_VIEW", view);
        },
        addCachedView({ commit }, view) {
            commit("ADD_CACHED_VIEW", view);
        },

        delView({ dispatch, state }, view) {
            return new Promise(resolve => {
                dispatch("delVisitedView", view);
                dispatch("delCachedView", view);
                resolve({
                    visitedViews: [...state.visitedViews],
                    cachedViews: [...state.cachedViews]
                });
            });
        },
        delVisitedView({ commit, state }, view) {
            return new Promise(resolve => {
                commit("DEL_VISITED_VIEW", view);
                resolve([...state.visitedViews]);
            });
        },
        delCachedView({ commit, state }, view) {
            return new Promise(resolve => {
                commit("DEL_CACHED_VIEW", view);
                resolve([...state.cachedViews]);
            });
        },

        delOthersViews({ dispatch, state }, view) {
            return new Promise(resolve => {
                dispatch("delOthersVisitedViews", view);
                dispatch("delOthersCachedViews", view);
                resolve({
                    visitedViews: [...state.visitedViews],
                    cachedViews: [...state.cachedViews]
                });
            });
        },
        delOthersVisitedViews({ commit, state }, view) {
            return new Promise(resolve => {
                commit("DEL_OTHERS_VISITED_VIEWS", view);
                resolve([...state.visitedViews]);
            });
        },
        delOthersCachedViews({ commit, state }, view) {
            return new Promise(resolve => {
                commit("DEL_OTHERS_CACHED_VIEWS", view);
                resolve([...state.cachedViews]);
            });
        },

        delAllViews({ dispatch, state }, view) {
            return new Promise(resolve => {
                dispatch("delAllVisitedViews", view);
                dispatch("delAllCachedViews", view);
                resolve({
                    visitedViews: [...state.visitedViews],
                    cachedViews: [...state.cachedViews]
                });
            });
        },
        delAllVisitedViews({ commit, state }) {
            return new Promise(resolve => {
                commit("DEL_ALL_VISITED_VIEWS");
                resolve([...state.visitedViews]);
            });
        },
        delAllCachedViews({ commit, state }) {
            return new Promise(resolve => {
                commit("DEL_ALL_CACHED_VIEWS");
                resolve([...state.cachedViews]);
            });
        },

        updateVisitedView({ commit }, view) {
            commit("UPDATE_VISITED_VIEW", view);
        }
    }
};

export default tagsView;
